.xtx-product-info{
    overflow: hidden;
    margin: 0 auto;
    margin-top: 80px;
}
.xtx_header {
    position: fixed;
    left: 0;
    width: 100%;
    height: 100px;
    background-color: white;
    transition: all .3s;
    z-index: 1;
}

.header_fixed {
    width: 300px;
    height: 100px;
    background-color: white;
    margin-top: 500px;
}
